Google Calendar is a free time-management web application offered by Google. Turn on Applets to add the most important information, right into your calendar, automatically — and get custom notifications about the events that matter the most to you.

FollowUp.cc is a timed email reminder system that gives users the ability to create reminders via email through formatted email addresses in the TO, CC and BCC fields. Allows users to set time based email reminders for individuals or from groups for single or recurring events.